PostgreSQL is a cross-platform database that runs on all major operating systems. Because of its free and open-source nature, this is a popular choice among startups. PostgreSQL is also easy to learn and setup compared to other relational databases available. It has been in active development for the last 30+ years and is considered to be one of the most advanced relational databases out there. Instead, we will use plain SQL queries, which you can then build off of for more complex database interactions. But we won't use using such an ORM module in this article. It is a popular and matured module compared to other PostgreSQL clients.Īlso, you can use PostgreSQL with an ORM such as Sequelize as well. In this article, we will be using the node-postgres module. There are a few different clients you can use to integrate PostgreSQL with Node.js. We will be using simple javascript ES6 syntax in this article. In order to better follow this article, we'd recommend that you have prior experience using Node.js and SQL statements. Let’s create a notes.In this article, we will discuss how to integrate PostgreSQL with Node.js. The resolvers are grouped in a JavaScript object, often called a resolver map. Each top-level query in the Query type has a resolver but we’ll make our own per field. Resolvers are responsible for manipulating and returning data, think of them as the query handlers. Here’s what’s in our schema/notes.js: import from "apollo-server-express" Įxport default Resolvers These are defined using the GraphQL Schema Language and allows us to talk about GraphQL schemas in a language-agnostic way. The schema contains type definitions from a mandatory top-level Query type that allows reading of data followed by field and nested fields. The GraphQL schema provided to the Apollo Server is all of the available data for reading and writing data via GraphQL. But first, let’s cover schema and resolvers. Our next step would be to define our schema and resolvers for the Apollo Server instance. You may also note we applied cors to our Express application, this is to allow external domains to access our application. Also, you can specify the path for your GraphQL API endpoint. Using Apollo Server’s applyMiddleware() method, you can opt-in any middleware, which in our case is the Express app. Let’s go through what we have so far, in the code above, we have initialized an Express application as well as an Apollo server instance. Now we are all set to start creating our server. While we are using it with Express, it may be used with several popular libraries such as Hapi and Koa. One of the dependencies we have installed is apollo-server, Apollo Server is the best way to quickly build a production-ready, self-documenting API for GraphQL clients, using data from any source. Now let us install our first set of dependencies: npm install apollo-server apollo-server-express express graphql cors -save We’ll have a few initial dependencies to install, but first, we’ll need to initiate our app, run: npm init Our backend server will run on Node JS and Express. How to set up an Apollo server with Express In order to build our application, you will need to be familiar with: The folder structure for our project will be as shown in this repo. In the second part, we will build an application with React Native that will consume data from our server. To do this, we’ll be building a simple note-taking app that allows our user to add notes, view, edit and delete them.įor the first part, we’ll be building a GraphQL server with a PostgreSQL database that will serve as the backend of our application. In this two-part series, we’ll be looking at how we can develop an application with React Native and GraphQL. With React Native you can write an application that works on both platforms with the only difference coming at the view level, with iOS and Android rendering differently. React Native is a great option when it comes to developing mobile applications for both iOS and Android smartphones. Austin Roy Omondi Follow Live long and prosper □ How to create a React Native app with PostgreSQL and GraphQL: Part 1
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